Three capacitors each of 6μF are available. The minimum and maximum capacitances which may be obtained are
|
(a) 6 μF, 18 μF |
(b) 3 μF, 12 μF |
(c) 2 μF, 12 μF |
(d) 2 μF, 18 μF |
(d) 2 μF, 18 μF
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Electric charge is uniformly distributed along a long straight wire of radius 1mm. The charge per cm length of the wire is Q coulomb. Another cylindrical surface of radius 50 cm and length 1m symmetrically encloses the wire as shown in the figure. The total electric flux passing through the cylindrical surface is
|
(a) |
(b) |
(c) |
(d) |
A cell of internal resistance 1.5Ω and of e.m.f. 1.5 volt balances 500 cm on a potentiometer wire. If a wire of 15 Ω is connected between the balance point and the cell, then the balance point will shift
|
(a) To zero |
(b) By 500 cm |
(c) By 750 cm |
(d) None of the above |
An infinitely long conductor PQR is bent to form a right angle as shown. A current I flows through PQR The magnetic field due to this current at the point M is H1. Now another infinitely long straight conductor QS is connected at Q so that the current is I/2 in QR as well as in QS, The current in PQ remaining unchanged. The magnetic field at M is now 
The ratio 
is given by
|
(a) |
(b) 1 |
(c) |
(d) 2 |
If an electron enters a magnetic field with its velocity pointing in the same direction as the magnetic field, then
|
(a) The electron will turn to its right |
|
(b) The electron will turn to its left |
|
(c) The velocity of the electron will increase |
|
(d) The velocity of the electron will remain unchanged |
An element A decays into element C by a two step process :
A → B + 
B → C + 
Then
|
(a) A and C are isotopes |
(b) A and C are isobars |
|
(c) A and B are isotopes |
(d) A and B are isobars |
